Remove compiled files in clean-setup and don't collect static files in init #3875

Job	Run time
Build wheel	1m 59s
Test (shuffled order)	2m 25s
Linter	2m 6s
Formatting	1m 36s
Backup process	3m 9s
MyPy	1m 32s
Render Html pages	1m 43s
Test + Coverage	2m 48s
Test if testdata is up to date	1m 58s
Compile Scss	1m 33s
Build nix environment on MacOS	3m 2s
Test Typescript	1m 52s
Install wheel with system Python	10s
	25m 53s

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